o___0
o___0
o___0
o___0
HOW WHAT WHEN WHERE ???/1111!!!!!!!
So the past two years of Naruto jut got thrown on it's head. So, who is the "real" Madara?
Theory #1
At the very least, we can be sure that the masked Madara is one of the Sage's descendants - either a Senju/Uzumaki or an Uchiha.
But, look at this line:
"When Madara finds Nagato's body, he sees that he is smiling even in death, which Madara interpreted as his continued betrayal. After closing Nagato's eyes, Madara teleports the body away to the pocket dimension. Madara returns to his hideout and replaces his blinded Sharingan with one of Nagato's Rinnegan, and gets a new arm, mask, and outfit.
Kabuto complemented him on his efforts to gain new eyes, but Madara rebuffed the statement, claiming that they were his to begin with"
His to begin with? That struck me as some sort of ownership, sort of in the way a parent could feel towards a child or an heir.
Therfore:
The Sage of the 6 Paths has returned to
undo what he never should have done in the first place - saved the world from the 10 Tails. He has seen how horrible the ninja world has become since then; so far from what he originally intended, and he would be disappointed with how his descendents have been doing things. Now, he's going to reform the beast and create the world anew as he wants, how it should have been. So, our masked Madara is in fact the Rikoudo Sage, in some shape or form.
Theory #2
Masked Madara is who we always thought he was. Obito, using the spectre of his more frightening ancestor to his advantage, survived the 3rd great war and is out for revenge.
Theory #3
Izuna Uchiha, Brother of Madara. Notice how masked Madara is incapable of MS Sharingan, so we could infer his eyes aren't his. Which is something we see a lof of from masked Madara, eye transplanting and stealing.
Theory #4
Shisui Uchiha. Koto Amatsukami would be able to fool Itachi and Danzo, as well as anyone else. The timeline for it's usage, every ten years or so, would mean it was used sometime after the Uchiha Massacre, 2-3 years after the Kyuubi attack. (so naruto and sasuke are 17, meaning 10 years before current shippuden time was when the jutsu was used last, which is more or less the same time as the massacre.)
Interesting tidbit: